Dab tsi yog RNA polymerase txav raws DNA?
Dab tsi yog RNA polymerase txav raws DNA?

Video: Dab tsi yog RNA polymerase txav raws DNA?

Video: Dab tsi yog RNA polymerase txav raws DNA?
Video: Kev hlub tsis ncaj ncees.10/15/2017 2024, Kaum ib hlis
Anonim

RNA polymerase synthesizes ib RNA transcript complementary rau lub DNA template strand hauv 5' rau 3' kev taw qhia . Nws txav pem hauv ntej nrog template strand nyob rau hauv lub 3' mus rau 5' kev taw qhia , qhib lub DNA ob helix li nws mus.

Ntxiv mus, koj nyeem DNA nyob rau hauv txoj kev twg?

Thaum transcription, RNA polymerase nyeem tus qauv DNA 3' → 5' kev taw qhia , tab sis mRNA yog tsim nyob rau hauv lub 5' rau 3' kev taw qhia . mRNA yog ib leeg-stranded thiab yog li ntawd tsuas muaj peb ua tau nyeem ntawv thav duab, ntawm uas tsuas yog ib qho yog txhais.

Ib yam li ntawd, ua li cas RNA polymerase unwind DNA? Cov enzyme RNA polymerase khi rau lub template strand ntawm DNA thaum pib ntawm qhov sib lawv liag kom tau theej. RNA polymerase tshem tawm / "unzips" cov DNA los ntawm kev rhuav tshem cov hydrogen bonds ntawm cov nucleotides ntxiv. RNA nucleotides yog ua ke nrog kev sib ntxiv DNA hauv paus.

Tsis tas li ntawd, qhov kev taw qhia twg yog RNA tsim?

Transcription ntawm ob lub noob. (a) RNA polymerase txav los ntawm 3' kawg ntawm lub template strand, tsim ib RNA strand uas loj hlob hauv 5' → 3' kev taw qhia (vim nws yuav tsum yog antiparallel rau lub template strand).

DNA hloov pauv li cas?

kev sau ntawv / DNA transcription . Kev sau ntawv yog tus txheej txheem uas cov ntaub ntawv nyob rau hauv ib tug strand ntawm DNA yog theej rau hauv ib lub molecule tshiab ntawm tus tub txib RNA (mRNA). Cov tshiab tsim mRNA cov ntawv luam ntawm cov noob ces ua daim ntawv qhia txog cov protein synthesis thaum lub sijhawm kev txhais lus.

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